The EVAC Arp Galaxy Observing Program

In 1966 Dr. Halton C. Arp cataloged 338 galaxies in his Atlas of Peculiar Galaxies from photographs from the 200-inch Palomar telescope. The entrants contain peculiar galaxies, interacting pairs and larger groups. A peculiar galaxy is an irregular galaxy that has an abnormal shape (neither elliptical, spiral, nor lenticular) and/or has another unusual characteristic, like jets of gas spewing from the nucleus, unusual amounts of dust, low surface brightness, etc. They are probably formed as galaxies collide or have companion galaxies that influence them.

This program contains 72 galaxies from the Arp catalog having a mean surface brightness less than 24 (less than 23.9 Mag/arc-second^2). The definition of surface brightness is the measure of an object's brightness per unit area. Typically surface brightness is expressed as stellar magnitudes per square arc-second.


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Object Con RA Dec Mag Size SBr S.A. U2000
Arp 249  Peg 00h00m34.1s +2301'02" 15.4 53"x 29" 23.1 4 I-125
Arp 256  Cet 00h19m04.9s -1020'00" 14.8 1.1'x 0.5' 22.9 17 II-261
Arp 35 Psc 00h22m37.9s -0116'35" 15.1 1.3'x 0.6' 23.4 17 I+II-216
Arp 251  Cet 00h54m02.7s -1349'45" 15.3 59"x 32" 23.2 10 II-262
Arp 121 Cet 00h59m38.3s -0446'35" 14.6 2.2'x 0.6' 23.5 10 I+II-217
Arp 11 Psc 01h09m37.1s +1422'05" 14.5 1.5'x 0.8' 23.3 10 I-172
Arp 128  Psc 01h17m43.3s +1443'48" 15.4 40"x 14" 22.0 10 I-172
Arp 119 Psc 01h19m39.3s +1228'22" 15.2 1.1'x 0.6' 23.4 10 I-172
Arp 67 Cet 01h21m31.4s -0031'09" 13.9 1.7'x 1.5' 23.5 10 I+II-218
Arp 70  Psc 01h23m44.0s +3048'34" 15.4 1.5'x 0.5' 23.6 4 I-91
Arp 306  Psc 01h32m44.5s +0437'37" 14.8 1.0'x 0.7' 23.0 10 I+II-218
Arp 4  Cet 01h48m46.1s -1221'45" 15.1 45"x 33" 22.8 10 II-263
Arp 56 Ari 01h57m42.4s +1714'42" 15.6 52"x 36" 23.5 10 I-129
Arp 273 And 02h21m45.9s +3923'56" 14.5 1.9'x 1.0' 23.8 4 I-62
Arp 54 Cet 02h24m16.9s -0440'14" 14.9 1.0'x 0.6' 22.9 10 I+II-220
Arp 258 Ari 02h39m22.0s +1824'21" 15.5 1.2'x 0.6' 23.8 10 I-130
Arp 131 Eri 02h47m33.4s -1446'51" 15.1 52"x 34" 23.0 10 II-265
Arp 219 Eri 03h40m07.8s -0205'48" 14.9 48"x 40" 22.8 11 I+II-222
Arp 20  Tau 04h20m08.6s +0206'29" 14.8 1.1'x 0.7' 23.0 11 I+II-223
Arp 61 Eri 04h36m54.7s -0216'47" 15.1 1.1'x 0.5' 22.9 11 I+II-224
Arp 180 Eri 04h53m38.8s -0447'04" 15.0 1.2'x 0.5' 23.0 11 I+II-224
Arp 187 Eri 05h05m06.6s -1014'30" 15.0 52"x 27" 22.6 11 II-270
Arp 52 Ori 05h19m56.0s +0344'09" 15.6 42"x 26" 22.9 11 I+II-225
Arp 96 Cep 07h04m27.2s +8634'43" 15.2 52"x 28" 22.9 1 I-1
Arp 141 Cam 07h14m58.0s +7328'40" 13.4 2.3'x 1.1' 23.1 1 I-7
Arp 17 Cam 07h45m19.3s +7348'52" 14.7 1.1'x 0.6' 22.9 1 I-7
Arp 58 Cnc 08h32m15.6s +1911'45" 15.4 1.3'x 0.6' 23.8 6 I-141
Arp 7 Hya 08h50m35.0s -1636'06" 13.8 1.3'x 0.9' 22.7 12 II-277
Arp 237  Leo 09h28m00.9s +1215'57" 15.3 39"x 29" 22.7 12 I-188
Arp 300   UMa 09h28m31.0s +6824'13" 14.7 1.5'x 0.9' 23.6 2 I-23
Arp 207   Dra 09h31m46.4s +7626'51" 15.4 1.1'x 0.2' 22.6 2 I-8
Arp 221  Hya 09h36m43.0s -1121'21" 13.0 1.9'x 1.6' 22.8 13 II-278
Arp 321  Hya 09h39m09.5s -0453'08" 15.6 1.0'x 0.3' 22.8 13 I+II-233
Arp 253 Sex 09h43m43.4s -0518'11" 14.8 1.3'x 0.4' 22.7 13 I+II-233
Arp 252  Hya 09h45m13.3s -1945'06" 15.5 50"x 25" 23.0 20 II-323
Arp 255  Leo 09h53m25.7s +0750'30" 15.4 42"x 32" 22.9 13 I-189
Arp 233  UMa 10h32m53.1s +5422'41" 14.1 1.1'x 0.9' 22.6 2 I-46
Arp 291  Leo 10h43m05.9s +1325'57" 13.8 1.1'x 1.0' 22.7 13 I-190
Arp 156 Dra 10h43m09.9s +7728'21" 15.0 1.4'x 0.7' 23.6 2 I-8
Arp 107 LMi 10h52m33.4s +3001'50" 14.8 1.4'x 1.1' 23.9 6 I-105
Arp 21 LMi 11h05m16.6s +3000'02" 14.8 55"x 41" 22.9 6 I-106
Arp 191  Leo 11h07m37.0s +1824'09" 15.6 51"x 36" 23.5 13 I-146
Arp 301  Leo 11h10m09.3s +2414'05" 14.9 59"x 38" 23.0 6 I-146
Arp 296  UMa 11h29m05.8s +5834'05" 15.9 37"x 32" 23.3 2 I-46
Arp 322   UMa 11h32m56.1s +5255'15" 15.8 18"x 15" 21.6 2 I-47
Arp 161 Vir 11h42m29.1s +0018'13" 14.8 1.1'x 0.6' 23.1 13 I+II-237
Arp 115 Leo 11h43m20.3s +2614'55" 15.4 52"x 29" 23.1 6 I-147
Arp 62  UMa 11h53m57.9s +4325'57" 14.4 1.5'x 0.5' 22.6 6 I-74
Arp 194 UMa 11h58m12.5s +3621'52" 14.8 1.2'x 0.8' 23.3 6 I-107
Arp 260  Com 12h13m54.8s +1605'24" 15.1 1.1'x 0.5' 23.2 13 I-193
Arp 238 UMa 13h15m50.2s +6205'51" 15.9 57"x 32" 23.8 2 I-26
Arp 57 Com 13h17m04.2s +1423'57" 15.5 43"x 25" 22.8 14 I-195
Arp 334 CVn 13h30m42.0s +3135'37" 13.9 2.2'x 0.9' 23.2 7 I-109
Arp 326   Vir 13h37m36.7s +0627'24" 15.5 59"x 16" 22.7 14 I-196
Arp 33 Vir 13h37m40.9s +0624'27" 15.3 1.4'x 0.6' 23.8 14 I-196
Arp 64 Boo 14h45m42.2s +1926'26" 15.3 1.5'x 0.4' 23.4 7 I-153
Arp 261  Lib 14h49m50.9s -1011'17" 13.4 2.4'x 1.4' 23.3 14 II-288
Arp 177   Boo 14h56m03.1s +2434'08" 15.5 44"x 35" 23.2 7 I-153
Arp 302  Boo 14h57m15.8s +2434'56" 15.3 45"x 40" 23.2 7 I-153
Arp 109  Dra 15h47m55.7s +6927'00" 15.8 45"x 30" 23.4 2 I-28
Arp 218 Ser 15h53m52.1s +1835'25" 15.9 45"x 22" 23.2 7 I-155
Arp 324  Her 16h02m32.6s +1557'23" 14.2 1.7'x 1.0' 23.4 15 I-200
Arp 101  Ser 16h04m47.4s +1448'02" 13.1 2.4'x 0.5' 21.8 15 I-200
Arp 66  Dra 16h27m03.3s +5132'19" 15.3 1.0'x 0.6' 23.4 8 I-51
Arp 125 Her 16h38m26.0s +4155'23" 15.0 1.1'x 0.4' 22.7 8 I-80
Arp 32 Dra 17h13m17.0s +5919'12" 14.3 56"x 23" 21.8 3 I-52
Arp 102  Her 17h19m31.1s +4901'44" 15.6 1.1'x 0.5' 23.7 8 I-81
Arp 325   Aqr 22h06m39.1s -2102'54" 15.7 44"x 17" 22.6 23 II-346
Arp 110  Aqr 22h54m24.9s -1512'38" 15.3 45"x 31" 22.9 17 II-303
Arp 314  Aqr 22h58m17.5s -0344'40" 13.9 1.1'x 0.8' 22.4 17 I+II-258
Arp 295 Aqr 23h42m02.5s -0338'25" 14.6 1.9'x 0.4' 23.0 17 I+II-259
Arp 262   Peg 23h56m59.4s +1650'05" 14.0 1.8'x 0.9' 23.2 17 I-170

S.A. = SkyAtlas 2000 chart number                    U2000 = Uranometria 2000 chart number

SBr = mean surface brightness per square arc-second


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